<template>
	<view>
		<view class="search-box">
			<uni-search-bar @confirm="search" @input="input" :radius="100" placeholder="请输入搜索内容"
			cancelButton="none" :focus="true"></uni-search-bar>
		</view>
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" inverted="true" 
				@click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				//搜索关键词
				kw:'',
				//搜索的结果列表
				searchResults:[],
				//搜索历史的数组
				historyList:[]
			};
		},
		onLoad() {
			// ||或的意思，kw不存在就运行【】
			//json.parse 将字符串转换成数组
		  this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]') 
		},
		methods:{
			//input输入事件的处理函数
			
			input(e){
				clearTimeout(this.timer)
				//设置延时器500ms未输入则打印
				this.timer = setTimeout(()=>{
					//将e的值赋值给kw储存起来
					this.kw = e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				//判断搜索关键词是否为空
				if(this.kw.length === 0){
					this.searchResults =[]
					return
				}
				//如果不为空则执行下面代码
				const{data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query : this.kw})
				if(res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				this.saveSearchHistory()
			},
			gotoDetail(item){
				console.log(item.goods_id);
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.histories)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				
				// 调用 uni.setStorageSync将搜索历史记录持久化存储到本地
				 uni.setStorageSync('kw',JSON.stringify(this.historyList))
				//json.stringify把数组转成字符串
				
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
				
			}
		},
		computed:{
			histories(){
				//reverse实现数据翻转
				// return[...[...new Set(this.historyList)]].reverse()
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box{
		position: sticky;
		top:0;
		z-index: 999;
	}
	.sugg-list{
		padding: 0 5px;
		
		.sugg-item{
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			
			.goods-name{
				//设置文本为单行文本
				white-space: nowrap;
				//超出的部分进行隐藏
				overflow: hidden;
				//超出的内容设置为 ...
				text-overflow: ellipsis;
			}
		}
	}
	
	.history-box{
		padding: 0 5px;
		.history-title{
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			
			.uni-tag{
				margin-top: 5px;
				margin-right: 5px;
			}
		}
	}
</style>
